CN114197210A - Hydrophobically modified viscose fiber and preparation method thereof - Google Patents
Hydrophobically modified viscose fiber and preparation method thereof Download PDFInfo
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- CN114197210A CN114197210A CN202111567669.5A CN202111567669A CN114197210A CN 114197210 A CN114197210 A CN 114197210A CN 202111567669 A CN202111567669 A CN 202111567669A CN 114197210 A CN114197210 A CN 114197210A
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- fiber
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- 239000000835 fiber Substances 0.000 title claims abstract description 154
- 229920000297 Rayon Polymers 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000009987 spinning Methods 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000002156 mixing Methods 0.000 claims abstract description 51
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 45
- 239000000243 solution Substances 0.000 claims abstract description 39
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000005871 repellent Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 229920000875 Dissolving pulp Polymers 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 19
- 230000002940 repellent Effects 0.000 claims abstract description 18
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000011550 stock solution Substances 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 64
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000006477 desulfuration reaction Methods 0.000 claims description 20
- 230000023556 desulfurization Effects 0.000 claims description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 230000001112 coagulating effect Effects 0.000 claims description 16
- 239000003398 denaturant Substances 0.000 claims description 16
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 14
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 239000011121 hardwood Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000011122 softwood Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 238000004383 yellowing Methods 0.000 claims description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 8
- 238000004061 bleaching Methods 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 8
- ZBJVLWIYKOAYQH-UHFFFAOYSA-N naphthalen-2-yl 2-hydroxybenzoate Chemical compound OC1=CC=CC=C1C(=O)OC1=CC=C(C=CC=C2)C2=C1 ZBJVLWIYKOAYQH-UHFFFAOYSA-N 0.000 claims description 8
- 230000005070 ripening Effects 0.000 claims description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 8
- 235000011152 sodium sulphate Nutrition 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 8
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 8
- 229960001763 zinc sulfate Drugs 0.000 claims description 8
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 8
- 229920000609 methyl cellulose Polymers 0.000 claims description 4
- 239000001923 methylcellulose Substances 0.000 claims description 4
- 235000010981 methylcellulose Nutrition 0.000 claims description 4
- 239000002736 nonionic surfactant Substances 0.000 claims description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract description 13
- 238000011282 treatment Methods 0.000 abstract description 10
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 241001397809 Hakea leucoptera Species 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 125000002091 cationic group Chemical group 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000003009 desulfurizing effect Effects 0.000 description 7
- 239000012948 isocyanate Substances 0.000 description 7
- 150000002513 isocyanates Chemical group 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 6
- 239000004814 polyurethane Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 230000003075 superhydrophobic effect Effects 0.000 description 4
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 150000001450 anions Chemical group 0.000 description 1
- 238000010560 atom transfer radical polymerization reaction Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- -1 polyoxyethylene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/02—Chemical after-treatment of artificial filaments or the like during manufacture of cellulose, cellulose derivatives, or proteins
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
- D01F2/08—Composition of the spinning solution or the bath
- D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/395—Isocyanates
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/53—Polyethers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/12—Hydrophobic properties
Abstract
The invention discloses a hydrophobic modified viscose fiber and a preparation method thereof, wherein needle wood dissolving pulp and broad leaf wood dissolving pulp mixed pulp with whiteness of more than 89% and methyl fiber content of more than 90% are selected, viscose spinning stock solution is prepared after a series of treatments, and the viscose spinning stock solution is uniformly mixed with titanium dioxide dispersion liquid and then is sent to spinning. The spinning solution is sent to a spinning machine to react, solidify and regenerate nascent fiber; drafting, orienting and cutting the solidified and regenerated nascent fiber, and then feeding the nascent fiber into a fluff tank to form viscose staple fiber fluff with uniform fiber layer thickness; and (3) delivering the viscose staple fiber from the fluff tank into a refiner, performing hydrophobic modification on the fiber surface in a refining oiling process, and drying to obtain the hydrophobically modified viscose fiber. The hydrophobic viscose fiber prepared by the invention has good hydrophobic performance and washability. In the preparation process, the problems of agglomeration generated by mixing a water repellent agent and an oil agent, the washability of the hydrophobic modified fiber and the spinnability generated by an addition method before spinning are effectively solved.
Description
Technical Field
The invention relates to the technical field of chemical fiber processing, in particular to a preparation method of hydrophobically modified viscose fiber and the hydrophobically modified viscose fiber prepared by the preparation method.
Background
With the improvement of economic living standard and the increase of population, people have more and more demands on the non-woven fabrics for medical sanitary materials. The clean high-whiteness viscose fibers are a type of differential viscose fibers and are widely used in the field of non-woven fabrics, but when the clean high-whiteness viscose fibers are used as surface layer materials in the field of paper diapers, the surface layer materials are easy to diffuse liquid quickly to generate a liquid reverse osmosis phenomenon due to poor hydrophobic performance (the water absorption and sedimentation time is usually less than 5 s), and the wearing comfort of the paper diapers is poor. In the field of paper diapers, in order to avoid the phenomenon of liquid reverse osmosis, a low-water-absorption material is often used as a surface layer material, but the wearing comfort is poor, and the diaper is not a biodegradable material. Therefore, in order to solve the above problems, it is necessary to develop hydrophobically modified viscose fibers to meet the market demand.
The construction of a hydrophobic coating on the surface of a fiber by an after-finishing method is one of the main methods for preparing hydrophobic fiber materials. CN201910871468.0 discloses a hydrophobic modification method of fiber, which adopts a mode of spraying a hydrophobic agent to carry out hydrophobic modification on the fiber. CN201510158836.9 discloses a method for preparing a super-hydrophobic textile by fiber surface polymerization modification, which grafts a methacrylate monomer onto a polyester surface by a surface-initiated atom transfer radical polymerization (SI-ATRP) method to form a high polymer hydrophobic layer on the fiber surface, thereby obtaining a super-hydrophobic polyester fabric. CN201510913731.X discloses a fluorine-free super-hydrophobic cotton fabric and a preparation method thereof, wherein hydroxyl of cotton fiber and nano TiO are utilized in the method2The chemical reaction between hydroxyl groups in the hydrosol enables the constructed rough surface to have good fastness, and the structural characteristics of the bionic lotus leaf surface are adopted, and the molten wax is solidified and crystallized on the rough surface of the oxide to carry out organic modification, so that the prepared fabric has excellent stability in the super-hydrophobic property. CN200910053646.5 discloses a fluorine-free nano durable super-water-repellent finishing method for cellulose fabrics, and relates to a method for preparing super-water-repellent textiles by utilizing a sol-gel technology. CN201880082162.0 discloses a method for producing a finely-divided hydrophobically modified cellulose fiber, which comprises a step of finely-dividing a hydrophobically modified cellulose fiber having a specific average fiber length in an organic solvent.
Although the existing hydrophobic fiber preparation technology makes certain progress, in the industrial production of water repellent finishing of cellulose fibers, because the fibers are required to be soaked in the water repellent finishing agent for tens of seconds to obtain the water repellent effect, some water repellent finishing agents which need to be soaked for a long time to have the water repellent effect are not suitable. In addition, the problems of poor fiber hydrophobic property uniformity, washability resistance, high cost, poor finished product quality and the like still exist in the preparation of the hydrophobically modified viscose fiber.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the preparation method of the hydrophobically modified viscose fiber is provided.
In order to solve the problems, the specific technical scheme of the invention is as follows:
a hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 4-6 g/L of oil agent component, 0.3-0.5 g/L of hydrogen peroxide and acid into water at the temperature of 68-72 ℃ to prepare an oil bath with the pH value of 3-4; and (3) continuously adding the dispersing agent in the oil bath, mixing for 5-15 min, then adding the fluorine-free hydrophobic agent, mixing for 5-15 min, finally adding the bridging agent, and mixing for 5-10 min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl cellulose content of more than 90%, and mixing the raw materials according to the weight ratio of 6-7: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100-0.9: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the viscose fiber.
Further, in the oiling and water repellent finishing liquid in the step (1), the ionic property of the oil agent is anion, the water repellent agent is a polyurethane compound, and the mass concentration of the water repellent agent in the oil bath is 0.4-2.0%; the dispersant is a nonionic surfactant; the bridging agent is isocyanate, and the mass ratio of the bridging agent to the hydrophobic agent is 1: 4-1: 6.
further, the addition method of each auxiliary agent in the oil bath comprises the following steps: and (3) in an oil bath, firstly adding a dispersing agent, mixing for 5-15 min, then adding a fluorine-free hydrophobic agent, mixing for 5-15 min, then adding a bridging agent, and mixing for 5-10 min for later use.
Further, the dispersant in the step (1) is polyoxyethylene derivative.
Further, the ionic nature of the hydrophobic agent in the step (1) is cation.
Further, the ionic property of the bridging agent in the step (1) is nonionic.
Further, in the dissolving process in the step (2), adding a fatty amine polyoxyethylene ether denaturant, wherein the mass ratio of the denaturant to the pulp is (2-4): 10000;
further, the coagulating bath in the step (2) comprises 110-120 g/L sulfuric acid, 300-320 g/L sodium sulfate, 9-13 g/L zinc sulfate and 10-11 g/L Berol Spin653 surfactant;
further, the spinning speed of the spinning machine in the step (2) is 55-60 m/min.
Further, the temperature of the first water washing in the step (3) is 70-75 ℃, the temperature of the second water washing is 60-70 ℃, the temperature of the third water washing is 55-70 ℃, and the temperature of the final water washing is 70-75 ℃.
Further, the desulfurizing agent used in the desulfurizing process in the step (3) is one or two of sodium hydroxide and sodium sulfide, the concentration of the desulfurizing agent is 2-4 g/L, and the desulfurizing temperature is 70-80 ℃.
Further, the temperature of the drying in the step (3) is 130-145 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.65-1.75 dtex; the length is 38-40 mm; the dry breaking strength is more than or equal to 1.7 cN/dtex; the dry breaking elongation is 18.0-25.0%; the whiteness is more than or equal to 85.0 percent; the water absorption settling time is more than or equal to 20 s.
The detection method of the index can refer to the industry standard FZT 54032-2010 clean high-whiteness viscose staple fiber.
The invention optimizes the spinning speed to obtain proper post-processing time and ensure the balance of yield and quality index.
The dispersant adopted by the invention is a nonionic surfactant, has better dispersing and anti-precipitation effects, and prevents precipitates from appearing in the oil and water repellent finishing liquid.
The ionic property of the hydrophobic agent adopted by the invention is cation, so that the hydrophobic property of the fiber is improved.
The invention adopts isocyanate bridging agent to improve the washability of the hydrophobic property of the fiber.
The invention selects proper concentration of the hydrophobic agent to reduce the reduction of the mechanical property and whiteness of the fiber caused by excessively high content of the hydrophobic agent.
The invention selects proper drying temperature to ensure that the hydrophobic performance has washability and avoid the yellowing phenomenon of hydrophobic fiber caused by overhigh temperature in drying.
The invention has the beneficial effects that:
(1) the polyurethane hydrophobic agent is preferably selected in the invention, and the prepared hydrophobic viscose fiber has better hydrophobic property and certain washability, and can be used in the fields of textile and non-woven.
(2) The invention adopts the mode of adding the dispersant and then adding the hydrophobic agent, thereby avoiding the problem of agglomeration generated by mixing the hydrophobic agent and the oil agent.
(3) The invention selects proper bridging agent to improve the hydrophobic property and wash resistance of the fiber.
(4) The invention preferably selects a cationic fluorine-free hydrophobic agent which has small influence on the whiteness of the fiber, and introduces the cationic fluorine-free hydrophobic agent to the fiber by adopting a post-treatment method, thereby being beneficial to avoiding the spinnability problem caused by the addition method before spinning and the waste liquid treatment problem caused by the loss of the hydrophobic agent in the spinning process.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
Example 1
A hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 4g/L of oil agent component, 0.3g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 68 ℃ to prepare an oil bath with the pH value of 3; and continuously adding 1g/L fatty alcohol-polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 5min, adding 4g/L cationic polyurethane resin serving as a hydrophobic agent, mixing for 5min, finally adding 1g/L nonionic isocyanate serving as a bridging agent, and mixing for 5min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl fiber content of more than 90%, and mixing the raw materials in a ratio of 6: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
The parameters that are preferred are those that,
preferably, the oil agent in step (1) has an anionic property.
Preferably, the ionic nature of the hydrophobic agent described in step (1) is cationic.
In the step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 2: 10000;
the coagulating bath comprises 110g/L sulfuric acid, 300g/L sodium sulfate, 9g/L zinc sulfate and 10g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 55 m/min.
The temperature of the first washing in the step (3) is 70 ℃, the temperature of the second washing is 60 ℃, the temperature of the third washing is 55 ℃, and the temperature of the final washing is 70 ℃.
The desulfurizer used in the desulfurization process in the step (3) is sodium hydroxide, the concentration of the desulfurizer is 2g/L, and the desulfurization temperature is 70 ℃.
The drying temperature in the step (3) is 130 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.65 dtex; the length is 38 mm; dry breaking strength 1.7 cN/dtex; the dry elongation at break was 25.0%; the whiteness is 86.0 percent; the water absorption settling time is 20 s.
Example 2
A hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 3g/L of oil agent component, 0.5g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 72 ℃ to prepare an oil bath with the pH value of 4; and continuously adding 2g/L fatty alcohol-polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 15min, then adding 5g/L cationic polyurethane modified organosilicon hydrophobic agent, mixing for 15min, finally adding 1g/L nonionic isocyanate serving as a bridging agent, and mixing for 15min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl cellulose content of more than 90%, and mixing the raw materials in a proportion of 7: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.9: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
The parameters that are preferred are those that,
in the step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 4: 10000;
the coagulating bath comprises 120g/L sulfuric acid, 320g/L sodium sulfate, 13g/L zinc sulfate and 11g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 60 m/min.
The temperature of the first water washing in the step (3) is 75 ℃, the temperature of the second water washing is 70 ℃, the temperature of the third water washing is 70 ℃, and the temperature of the final water washing is 75 ℃.
The desulfurizing agents used in the desulfurizing process in the step (3) are 3g/L sodium hydroxide and 1g/L sodium sulfide, and the desulfurizing temperature is 80 ℃.
The drying temperature in the step (3) is 145 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.75 dtex; the length is 40 mm; dry breaking strength 2.2 cN/dtex; the dry elongation at break was 18.0%; the whiteness is 85.0 percent; the water absorption settling time is 120 s.
Example 3
A hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 3.5g/L of oil agent component, 0.4g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 70 ℃ to prepare an oil bath with the pH value of 3.5; and continuously adding 1g/L fatty alcohol-polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 10min, then adding 5g/L cationic polyurethane modified organosilicon hydrophobic agent, mixing for 10min, finally adding 1g/L nonionic isocyanate bridging agent, and mixing for 10min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl fiber content of more than 90%, and mixing the raw materials in a ratio of 6: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
Preferred parameters, in step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 4: 10000;
the coagulating bath comprises 115g/L sulfuric acid, 300g/L sodium sulfate, 13g/L zinc sulfate and 11g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 59 m/min.
The temperature of the first water washing in the step (3) is 75 ℃, the temperature of the second water washing is 70 ℃, the temperature of the third water washing is 55 ℃, and the temperature of the final water washing is 75 ℃.
The desulfurizer used in the desulfurization process in the step (3) is 3g/L of sodium hydroxide, the concentration of the desulfurizer is 3g/L, and the desulfurization temperature is 80 ℃.
The drying temperature in the step (3) is 140 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.70 dtex; the length is 40 mm; dry breaking strength 2.1 cN/dtex; dry elongation at break 22%; the whiteness is 86.0 percent; the water absorption settling time is 180 s.
Example 4
A hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 3.5g/L of oil agent component, 0.4g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 70 ℃ to prepare an oil bath with the pH value of 3.5; and continuously adding 2g/L of octyl phenol polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 10min, then adding 15g/L of cationic polyurethane modified organosilicon hydrophobic agent, mixing for 10min, finally adding 1g/L of nonionic isocyanate bridging agent, and mixing for 10min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl fiber content of more than 90%, and mixing the raw materials in a ratio of 6: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
Preferred parameters, in step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 4: 10000; the coagulating bath comprises 115g/L sulfuric acid, 300g/L sodium sulfate, 13g/L zinc sulfate and 11g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 59 m/min.
The temperature of the first water washing in the step (3) is 75 ℃, the temperature of the second water washing is 70 ℃, the temperature of the third water washing is 55 ℃, and the temperature of the final water washing is 75 ℃.
The desulfurizer used in the desulfurization process in the step (3) is 3g/L of sodium hydroxide, the concentration of the desulfurizer is 3g/L, and the desulfurization temperature is 80 ℃.
The drying temperature in the step (3) is 140 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.70 dtex; the length is 40 mm; dry breaking strength 2.1 cN/dtex; dry elongation at break 22%; the whiteness is 85.0 percent; the water absorption settling time is more than 300 s.
Comparative example 1
A hydrophobically modified viscose fiber and a preparation method thereof comprise the following steps:
(1) preparing oiling water-repellent finishing liquid:
adding 3.5g/L of oil agent component, 0.4g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 70 ℃ to prepare an oil bath with the pH value of 3.5; and continuously adding 1g/L fatty alcohol-polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 10min, then adding 5g/L acrylate hydrophobic agent, mixing for 10min, finally adding 1g/L nonionic isocyanate bridging agent, and mixing for 10min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl fiber content of more than 90%, and mixing the raw materials in a ratio of 6: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
Preferred parameters, in step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 4: 10000;
the coagulating bath comprises 115g/L sulfuric acid, 300g/L sodium sulfate, 13g/L zinc sulfate and 11g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 59 m/min.
The temperature of the first water washing in the step (3) is 75 ℃, the temperature of the second water washing is 70 ℃, the temperature of the third water washing is 55 ℃, and the temperature of the final water washing is 75 ℃.
The desulfurizer used in the desulfurization process in the step (3) is 3g/L of sodium hydroxide, the concentration of the desulfurizer is 3g/L, and the desulfurization temperature is 80 ℃.
The drying temperature in the step (3) is 140 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.70 dtex; the length is 40 mm; dry breaking strength 2.1 cN/dtex; dry elongation at break 22%; the whiteness is 84.0%; the water absorption settling time is 170 s.
As can be seen from the above example 3 and comparative example 1, the whiteness index and the hydrophobic property of the fiber are changed by changing the kind of the hydrophobic agent.
Comparative example 2
(1) Preparing oiling water-repellent finishing liquid:
adding 3.5g/L of oil agent component, 0.4g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 70 ℃ to prepare an oil bath with the pH value of 3.5; and continuously adding 1g/L fatty alcohol-polyoxyethylene ether serving as a dispersing agent in an oil bath, mixing for 10min, then adding 5g/L cationic polyurethane modified organosilicon hydrophobic agent, and mixing for 10min for later use.
(2) Preparing viscose fibers:
selecting softwood dissolving pulp and hardwood dissolving pulp with whiteness of more than 89% and methyl fiber content of more than 90%, and mixing the raw materials in a ratio of 6: mixing the materials according to the mass ratio of 100, then sequentially carrying out the steps of dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening to prepare a viscose spinning solution, uniformly mixing the viscose spinning solution with a titanium dioxide dispersion solution, and then sending the viscose spinning solution into a spinning machine; the mass ratio of the titanium dioxide to the methyl fiber in the viscose stock solution is 0.7: 100. the spinning solution is sent to a spinning machine, sprayed out from a spinneret through a metering pump, and reacts with a coagulating bath in an acid bath tank to coagulate and regenerate nascent fiber; drafting and orienting the solidified and regenerated nascent fiber to form fiber with certain strength, cutting the fiber, and feeding the fiber into a fluff tank; the steam bubbles sprayed from the small holes of the steam spraying pipe at the bottom of the fluff slot disperse the fibers to make the thickness of the fiber layer uniform;
(3) post-treatment of viscose fibers:
and (3) delivering the viscose staple fiber from the fluff tank into a refiner, and sequentially performing primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oiling and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber.
Preferred parameters, in step (2):
in the dissolving process, a fatty amine polyoxyethylene ether denaturant is added, and the mass ratio of the denaturant to the pulp is 4: 10000; the coagulating bath comprises 115g/L sulfuric acid, 300g/L sodium sulfate, 13g/L zinc sulfate and 11g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 59 m/min.
The temperature of the first water washing in the step (3) is 75 ℃, the temperature of the second water washing is 70 ℃, the temperature of the third water washing is 55 ℃, and the temperature of the final water washing is 75 ℃.
The desulfurizer used in the desulfurization process in the step (3) is 3g/L of sodium hydroxide, the concentration of the desulfurizer is 3g/L, and the desulfurization temperature is 80 ℃.
The drying temperature in the step (3) is 140 ℃.
The technical parameters of the hydrophobically modified viscose fiber obtained by the invention are as follows: the fineness is 1.70 dtex; the length is 40 mm; dry breaking strength 2.1 cN/dtex; dry elongation at break 22%; the whiteness is 85.0 percent; the water absorption settling time is 90 s.
As can be seen from the above example 3 and comparative example 2, the hydrophobic properties of the fibers are somewhat reduced without the addition of the bridging agent.
Claims (9)
1. A method of making hydrophobically modified viscose comprising:
the mass ratio of the softwood dissolving pulp to the hardwood dissolving pulp is 6-7: 100, mixing dregs, and preparing a viscose spinning solution by sequentially dipping, squeezing, crushing, ageing, yellowing, dissolving and ripening;
uniformly mixing the viscose spinning solution and the titanium dioxide dispersion solution, feeding the mixture into a spinning machine, spraying the mixture from a spinneret through a metering pump, and reacting the mixture with a coagulating bath in an acid bath tank to obtain nascent fibers;
drafting, orienting and cutting the nascent fiber, and then feeding the nascent fiber into a fluff tank to form viscose staple fiber fluff with uniform fiber layer thickness;
sending the viscose staple fiber into a refiner, and sequentially carrying out primary washing, desulfurization, secondary washing, bleaching, tertiary washing, final washing, oil and water repellent finishing, dehydration and drying to obtain the hydrophobically modified viscose fiber;
wherein: the titer of the hydrophobically modified viscose fiber is 1.65-1.75 dtex; the length is 38-40 mm; the dry breaking strength is more than or equal to 1.7 cN/dtex; the dry breaking elongation is 18.0-25.0%; the whiteness is more than or equal to 85.0 percent; the water absorption settling time is more than or equal to 20 s.
2. The production method according to claim 1, wherein:
the whiteness of the dissolving pulp of the softwood dissolving pulp and the dissolving pulp of the hardwood dissolving pulp are both more than or equal to 89%, and the content of methyl cellulose is both more than or equal to 90%.
3. The production method according to claim 1, wherein:
in the dissolving process, adding a fatty amine polyoxyethylene ether denaturant, wherein the mass ratio of the denaturant to the mixed pulp is (2-4): 10000.
4. the production method according to claim 1, wherein:
the mass ratio of the titanium dioxide to the methyl cellulose in the viscose stock solution is (0.7-0.9): 100.
5. The production method according to claim 1, wherein:
the coagulating bath comprises 110-120 g/L sulfuric acid, 300-320 g/L sodium sulfate, 9-13 g/L zinc sulfate and 10-11 g/L Berol Spin653 surfactant;
the spinning speed of the spinning machine is 50-60 m/min.
6. The production method according to claim 1, wherein:
the first washing temperature is 70-75 ℃, the second washing temperature is 60-70 ℃, the third washing temperature is 55-70 ℃, and the final washing temperature is 70-75 ℃;
the desulfurizer used for desulfurization is one or two of sodium hydroxide and sodium sulfide, the concentration of the desulfurizer is 2-4 g/L, and the desulfurization temperature is 70-80 ℃.
7. The production method according to claim 1, wherein:
the oiling water-repellent finishing liquid is prepared by the following method:
adding 4-6 g/L of oil agent component, 0.3-0.5 g/L of hydrogen peroxide and sulfuric acid into water at the temperature of 68-72 ℃ to prepare an oil bath with the pH value of 3-4;
continuously adding 1-2 g/L of nonionic surfactant serving as a dispersing agent in an oil bath, mixing for 5-15 min, then adding 5-15 g/L of fluorine-free hydrophobic agent, and mixing for 5-15 min;
and finally, adding 1g/L of nonionic bridging agent, and mixing for 5-10 min to obtain the oiling water-repellent finishing liquid.
8. The production method according to claim 1, wherein:
the drying temperature is 130-145 ℃.
9. A hydrophobically modified viscose fiber prepared by the preparation method of any one of claims 1 to 8.
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